/Engine/Source/Developer/MaterialUtilities/Public/MaterialUtilities.h
Generates a set of texture boxes according to the given weights and final atlas texture size
static void GeneratedBinnedTextureSquares ( const FVector2D DestinationSize, [TArray](API\Runtime\Core\Containers\TArray)< float > & InTexureWeights, [TArray](API\Runtime\Core\Containers\TArray)< FBox2D > & OutGeneratedBoxes )